An estimation method for InSAR interferometric phase combined with image auto-coregistration |
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摘 要: | 1 Introduction Synthetic aperture radar interferometry (InSAR) is an important remote sensing tech- nique to retrieve the terrain digital elevation model (DEM)1,2]. Image coregistration and interferometric phase unwrapping are two key processing procedur…
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收稿时间: | 22 June 2005 |
修稿时间: | 14 November 2005 |
An estimation method for InSAR interferometric phase combined with image auto-coregistration |
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Authors: | LI Hai LI Zhenfang LIAO Guisheng BAO Zheng |
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Affiliation: | National Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China |
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Abstract: | In this paper we propose a method to estimate the InSAR interferometric phase of the steep terrain based on the terrain model of local plane by using the joint subspace projection technique proposed in our previous paper. The method takes ad- vantage of the coherence information of neighboring pixel pairs to auto-coregister the SAR images and employs the projection of the joint signal subspace onto the corresponding joint noise subspace to estimate the terrain interferometric phase. The method can auto-coregister the SAR images and reduce the interferometric phase noise simultane- ously. Theoretical analysis and computer simulation results show that the method can provide accurate estimate of the interferometric phase (interferogram) of very steep terrain even if the coregistration error reaches one pixel. The effectiveness of the method is veri- fied via simulated data and real data. |
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Keywords: | synthetic aperture radar interferometry (InSAR) subspace projection single-baseline interfer- ometric phase eigen-decomposition image coregistration local plane |
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